Stepped-pulley drive, particularly for ring-spinning machines



Oct. 15, 1929. HILDEBRANDT 1,731,246

STEPPED PULLEY DRIVE,PARTICULARLY FOR RING SPINNING MACHINES Filed May 21, 1928 Patented Get. 15, 1929 ITED STATES PATENT OFFICE JOHANN HILDEBRANDT, OF WALLISELLEN, SWITZERLAND, ASSIGNOR TO MASCHINEN- FABRIK OERLIKON', OFOERLIKON, SWITZERLAND, A CORPORATION OF SWITZER- LAND STEPPED-PULLEY DRIVE, PARTICULARLY FOR RING-SPINNING MACHINES Application filed May 21, 1928, Serial No. 279,279, and in Switzerland June 8, 1927.

This invention relates to stepped pulley drives, particularly for ring spinning machines.

In some spinning mills the female operatives at the ring spinning frames are paid not by the output, but by the number of revolutions of the delivery cylinder of the drawing frame. These operatives therefore endeavour to keep their machines running at the highest possible speed, without'paying any attention to the reduced output and inferior quality resulting from the large num ber of yarn breakages.

When driving with stepped pulleys with two speeds (for example of the type described in the specification of our British Patent No. 267550) the operatives, in defiance of all instructions, always put the belt on the largest stepped pulley of the motor, and do not utilize the advantages starting and at the nose of the bobbin. This is against the interests of the proprietor, whose endeavour is to obtain the maximum production without breakage of the yarns, if possible, and without loss of quality.

The millowners therefore demand and mechanism has already been proposed for the changing of the belt from the smaller to the larger pulley and vice versa to be effected automatically and always at the moments most favorable for the building of the bobbin. Such an arrangement must moreover be protected against arbitrary adjustment by the workers. Since the duration of building of a bobbin can vary according to the count of theyarn, between 15 minutes in the case of coarse, and 14 hours in the case of fine yarns, the arrangement must also be of such a nature that the intervals between the changing of the belt in the one or other direction can be modified by the foreman, according to requirements and in the simplest manner. Furthermore the arrangement must be such that Whenthe operative sets the frame back into position for forming a new bobbin, all parts of the device return automatically into their original position, so that the operative has merely to perform the operations needed for minding the frame.

The present invention aims at providing of a lower speed in an arrangement which completely fulfils the aforesaid conditions.

The invention will hereinafter be explained with reference to the accompanying drawings which illustrate by way of example one embodiment thereof and which show only such parts as are required to elucidate the invention. In said drawings Figs. 1 and 2 represent the aforesaid parts 1n two different views;

Figs. 3 to 5 represent details, on a larger scale, and partly in difierent Working posi tions.

the disc 2, whereby the clutch collar 12, ,WlllCh is slldable but not rotatable on the shaft 11, is caused to engage the bevel pinion 14 which is adapted to turn freely on the shaftll. The pinion 16 on the shaft 11 is driven from the roller shaft of the working machine.

The coupled pinion 14 now actuates the bevel wheel 17 of the threaded spindle 18 ('F1g. 2) and the nut 20 connected to the belt-shifting device 19, is thus moved towards the right, the belt 21 being thereby slipped on to the large pulley 32. At the same time, a spring 22 is compressed after an arm 30, connected to the nut 20, has pushed the spring 22 and its rod 24 so far that the collar 25 on the rod 24 bears against a detent 29. At the end of the sliding move- -ment, the cam 26, which moves with the arm 30, lifts the detent 29, so that the thrust of the spring 22 causes the rod 24, to spring back suddenly towards the right, so that the oblique surface 28 on the rod 24 withdraws the rocking lever 9 from the notch 2, thereby disengaging the clutch collar 12 from the bevel pinion 14 and bringing the spindle 18 ,with the belt-shifting device 19 to a stand still. The arm is rectilinearly guided by the rod 24.

During the building of the nose of the bobbin, the rocking lever 10 drops into the notch l of the disc 1, thereby causing a clutch collar 13 to engage with a bevel pinion 15 which meshes with the bevel wheel 17, so that the spindle 18 is turned in the opposite direction, and thereby causes the belt 21 to be shifted towards the left, i. e., back on to the small pulley 31. The collar then bears against a detent 39, which must now be supposed to be in the position of the detent 29 in relation to the rod 2 1, and th *reupon the spring 23 is compressed. At the end of the movement, the cam 26 raises the detent 39 again, the rod 2 1 springs suddenly towards the left under the thrust of spring 23, and the oblique surface 27 turns the rocking ever 10 and moves the clutch 13 out of engagement with the bevel pinion 15. The travel of the rod 24 in both directions is limited by the collars 25 and 45, which bear in turn against the wall of the casing 46.

l Vhen the bobbin is completed, and the operative turns back the ratchet-wheel pin 6, the discs 1, 2 return to their original position. During this return movement, the rocking lever 10, which is lifted by theoblique surface 27, holds the collar 13 out of engagement with the bevel pinion 15, whilst the rocking lever 9 is able to drop into the notch 2 in the disc 2 and to bring the collar 12 into engagement with the bevel pinion 14. In order to enable this clutch also to return to its original posi tion, the rocking lever 9 bears against a spring-controlled teeth 41 adapted to pivot on the pin 3-5) of the disc 2. This tooth allows free passage to the rocking lever 9, inasmuch as the latter is raised by sliding over the flank 42 of said tooth (Fig. 5) thereby disengaging the collar 12 from the bevel pinion 14.

Between the two discs 1, 2 is disposed a leather disc 33 which is adapted to couple the T loose disc 2 with the fixed disc 1 on the wormwheel shaft 43 when the nut 44 is. tightened up. By unscrewing the nut 14, the disc 2 can be quickly and easily rotated in relation to the disc 1 or notch 1. The adjustment of the disc 1, or notch 1, is effected by rotating the worm l of the gear 3, 4 when the shaft 5 is disconnected. I

I claim 1. In a stepped pulley drive for a ring spinning frame, a shaft rotated by said frame, a timing device, a pair of relatively angularly displaceable notched discs conjointly rotated by the ratchet-wheel pin of said spinning frame, rocking levers bearing against said notched discs, and clutches on said rotated shaft displaced by said rocking levers into and out of engagement with said timing device.

2. In a stepped pulley drive for a rlng spinning frame, a shaft rotated by said frame, a timing device, a pair of relatively angularly displaceable notched discs conjointly rotated by the ratchet-wheel pin of said spinning frame, a pivoted tooth in the notch of one of said discs, a spring projecting said tooth, rocking levers bearing against said notched discs, and clutches on said rotated shaft displaced by said rocking levers into and out of engagement with said timing device. H

In a stepped pulley drive for a ring spin ning frame, a shaft rotated. by said frame, a timing device including bevel surfaces, a pair of relatively angularly displaceable notched discs conjointly rotated by the ratchet-wheel pin of said spinning frame, rocking levers bearing against said notched discs and displaced by said bevel surfaces of said timing device, and clutches on said rotated shaft displaced by said rocking levers into and out of engagement with said timing device.

4. In a stepped pulley drive for a ring spinning frame, a shaft rotated by said frame, a timing device including bevel surfaces, a pair of relatively angularly displaceable notched discs conjointly rotated by the ratchet-wheel pin of said spinning frame, a pivoted tooth in the notch of one of said discs, a spring projecting said tooth, rocking levers bearing against said notched discs and displaced by said bevel surfaces of said timing device, and clutches on said rotated shaft displaced by said rocking levers into and out of engagement with said timing device. I

In testimony whereof, I affix my signature.

JOI-IANN I-IILDEBRANDT.

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